Abstract
We have measured (\ensuremath{\gamma},p) and (\ensuremath{\gamma},n) differential yields at 90\ifmmode^\circ\else\textdegree\fi{} for the two-body photodisintegration of $^{4}\mathrm{He}$ using tagged photons of energy ${\mathit{E}}_{\ensuremath{\gamma}}$=25--60 MeV. Data for both channels were obtained simultaneously using windowless \ensuremath{\Delta}E-E telescopes to detect the $^{3}\mathrm{He}$ and $^{3}\mathrm{H}$ recoils. The ration of our angle-integrated yields, which is insensitive to systematic uncertainies due to the simultaneity of the measurements, agrees with calculations employing only charge-symmetric nuclear interactions. Thus, within the present errors, our data show no evidence of a significant charge-symmetry violation in $^{4}\mathrm{He}$ in this energy range.
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